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Federal Income Taxes - Income and Provision for Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
(Provision) benefit for income taxes:                      
Net income (loss) $ 14,665 $ 8,840 $ (5,237) $ 2,936 $ (6,671) $ (2,597) $ (2,270) $ (4,160) $ 21,204 $ (15,698) $ 64,308
Net loss (income) attributable to noncontrolling interests 6,645 1,618 14,317 9,261 13,801 11,822 9,935 11,579 31,841 47,137 (2,838)
Net income attributable to Acadia $ 21,310 $ 10,458 $ 9,080 $ 12,197 $ 7,130 $ 9,225 $ 7,665 $ 7,419 53,045 31,439 61,470
TRS [Member]                      
Income Tax Contingency [Line Items]                      
TRS loss before income taxes                 (3,117) (2,609) (3,604)
(Provision) benefit for income taxes:                      
Federal                 754 (377) (982)
State and local                 317 26 423
Net income (loss)                 (2,046) (2,960) (4,163)
Net loss (income) attributable to noncontrolling interests                 (369) 4 8
Net income attributable to Acadia                 $ (2,415) $ (2,956) $ (4,155)